Description
This evaluation board based on the PM6670AS device is a complete DDR2/3 power supply regulator for portable applications designed to meet JEDEC specifications. It integrates a constant on-time (COT) buck controller, a 2 Apk sink/source low dropout regulator and a 15 mA low noise buffered reference. The COT architecture assures fast transient response supporting both polymeric and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. The 2 Apk sink/source linear regulator provides the memory termination voltage with fast load transient response. The device is fully compliant with system sleep states S3 and S4/S5, providing LDO output high impedance in suspend-to-RAM and tracking discharge of all outputs in suspend-to-disk. STEVAL-ISA051V2

Features
■ 4.5 V to 36 V input voltage range
■ 0.9 V, ±1% voltage reference
■ 1.8 V (DDR2) or 1.5 V (DDR3) fixed output voltages
■ 0.9 V to 2.6 V adjustable output voltage
■ 1.237 V ±1% reference voltage available
■ Very fast load transient response using constant on-time loop control
■ No RSENSE current sensing using the RDS(on) of the low-side MOSFETs
■ Negative current limit
■ Latched OVP, UVP and thermal shutdown
■ Fixed 3 ms soft-start
■ Selectable pulse-skipping at light load
■ Selectable no-audible (33 kHz) pulse-skip mode
■ All ceramic output capacitors application supported
■ Output voltage ripple compensation